Hydraulic drive for pumps or compressors



Sept. 2, 1941. w wlRTH 2254,811

HYDRAULIC DRIV FOR PUMPS OR GOMPRESSORS y Filed Aug. 9, 1939 Patented Sept. 2,

unirsi-:1) STATES PATENT vOFFICE y 2,254,811 f A' HYDRAULIC DRIVE FOR PUMPS R COMPBESSORS l Wilhelm Wirth, Berlin-Siemensstat.

Germany,

assigner to Patentverwertungs-Gesellschaft mit beschrnkter Haftung. Hermes," Berlin, Germany, a corporation of Germany Application August 9. 1939, Serial No. 289,169 In Germany June 3, 1938 (Cl. 230-49l 4 Claims.

oi the liquid and the resistance to flow to a considerable extent and in order to nrmlyfsecure those parts of the compressor lor the pumlfto which are connected the suction conduit and pressure conduit to the housing of the refrigerating apparatus it is known in the art to design the driving device for the driving liquid in such` a manner that one portion of the liquid surrounding the compressorvescapes upon each compression stroke of the compressor in the direction in which the movable walls move when being compressed and ows back in the opposite direction upon each expansion stroke of the compressor. In compressors consisting only of two movable walls opposite to each other the drive is so designed that during the compression stroke a certain amount of the liquid surrounding the compressor is pressed against one movable wall of the compressor and at the same time a certain smaller quantity of liquid is drawn away from.

the opposite wall of the compressor. During the expansion stroke the corresponding quantity of liquid is then drawn away from the iirst-mentioned wall of the compressor and the corre'- sponding smaller amount of liquid is again pressed/against the other wall of the compressor.

'I'he invention relates to a drive of the lastmentioned type. The tank enclosing the pump or the compressor and containing the driving liquid is moved in an'upand downward direction by the driving device. In this manner it is possible to prevent particularly at the edge of the compressor walls the formation of a whirling motion in the driving liquid with the aid of very simple means. The arrangement is preferably so designed according to the invention that one wall of the tank containing the driving liquid is supported on the stationaryholder of the pump or compressor, in which are arranged the suctior. conduit and pressure conduit, and that a connecting rod of the driving device is in engagement with the opposite wall of the tank containing the driving liquid.

In the accompanying' drawing, comprising a single ligure, there is shown an embodiment of theinventlon in diagrammatic form. I I and 2 denote two resilient walls of a compressor. These walls are secured to each other by a metal strip 3 bent around the edges of the walls I and 2 and enclose the working chamber I which in operation is alternately increased or reduced. 'I'he central portion of the movable wall 2 is secured to a holder 5 in which are arranged the suction conduit 8 and' the pressure conduit '1 provided with the corresponding valves. 'I'he compressor is driven by a liquid, for instance,`

oil contained in the tank 8. This tank is moved according to the invention in the upand downward direction by a crank drive. To this end, the connecting rod III' of the crank drive is in engagement with the wall 8 of the tank. The opposite wall of themovable tank I I is supported on the holder 6 of the compressor.

, 'Ihe tank 8 is so supported that the iiange I2 of the wall II in contact with the holder I is slidable on the outer surface of the holder 5 in th upward and downward direction. On the pressure stroke, the receptacle or tank 8 is moved downwardly, and the liquid which is above the movable wall I is pressed against this wall. .At thesame time the pressure of the liquid vunderneaththe movable wall 2 against this wall is4 relieved. Accordingly, both walls are moved in chamber l. On the suction stroke, the tank 8 is moved upwardly, the liquid pressures are reversed, and a movement of the walls I and 2 is 4. The alternate contraction and expansion of the'working chamber which is thus eil'ected results in the desired circulation of the' refrigerant through the conduits 6 and l.

. By proper selection of the ratio of diameter d1 of theworking chamber I to the diameter drol' the holder 5, the vol'ume of liquid which is moved downward away from wall 2 on the pressure stroke can be made equal to the volume of liquid which is moved toward said wall on the suctionl stroke, and consequently during the operation of the pump no liquid will be transferred from that part of the tank which is below the working chamber to the part which lies above it, or vice versa. Since all iiow of liquid around the periphery of the working chamberis thus prevented. thelosses which formerly were incurred as the result of such currents in the liquid are avoided.

'Ihe invention having been described, that which is believed to'be new and for which the protection of Letters Patent is desired will be pointed out in the appended claims.

What is claimed is:

1. In a compressor type pump, two flexible walls secured together to 'form an expansible and contractible working chamber between them, inlet and outlet pipes communicating with said chamber, a tank surrounding said chamber, said tank having rigidly connected spacedwalls which are parallel to the plane of said working chamber, a liquid filling said tank, said liquid being in direct contact with said walls, and means for giving said tank a reciprocating motion to Acreate to said tanlc.

3. In a compressor type pump, a pump chamber comprising two dexible diaphragms secured together at their periphery, a centrally located support for one oi' said diaphragms, inlet and outlet conduits extending through said support to said chamber, valves controlling iiow through said conduits, a tank surrounding. said pump chamber and having two rigidly connected parallel walls, one of which has a sliding connection with said support, a liquid filling said tank, said liquid being in direct contact with said diaphragms, and means, secured to the other of said walls for giving the tank a reciprocating motion.

4. In a compressor type pump, a liquid nlled tank having two parallel spaced walls rigidly connected together, means for giving said tank a reciprocating motion along a line perpendicular to said walls, an expansible and contractible compressor inside said tank and surrounded by the liquid therein, said compressor having ilexible walls in direct contact with said liquid, a fixed support for said compressor extendixm through one of the walls oi said tank, and a liquid tight sliding `connection between said support and said lait mentioned wall.

WILHELM WIRTH. 

